“…These advantages include higher combining efficiencies due to reduced insertion loss and improved amplitude and phase balance, as well as reduced physical size and weight [1]- [3]. With few exceptions, these types of combiners have traditionally been difficult to design: Electromagnetic field analysis is used in [4], empirical techniques based on measurements is used in [5], and for some others no detailed design information is provided [6]- [8]. With the advent and continued improvement of 3D electromagnetic modeling software, the analyses and simplified design approaches of many variations based on radial, coaxial and conical transmission lines have been presented [9]- [15].…”